diff --git a/rosidl_generator_rs/cmake/custom_command.cmake b/rosidl_generator_rs/cmake/custom_command.cmake
index d16ccd8..8bba0ab 100644
--- a/rosidl_generator_rs/cmake/custom_command.cmake
+++ b/rosidl_generator_rs/cmake/custom_command.cmake
@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
+
 add_custom_command(
   OUTPUT
   ${_generated_common_rs_files}